BLOOD CIRCULATION. 
61 
ture of 78°, than when the atmosphere is not more than 
66° Fahr., as is often the case at the time of swarm- 
ing, while in reality a far less volume of air is con- 
sumed in August than in May, because the bees are 
not in the same state of excitement. 
Girard (46) has also shown by experiments that 
the temperature of the thorax is always in excess of 
that of the abdomen, in consequence of the more rapid 
respiration caused by the movement of flight. 
